Combined tap and surfacing implement



Sept. 8', 1936. A. E. DENNIS ET AL COMBINED TAP AND SURFACING IMPLEMENT Filed Sept. 30, 1955 INVENTORS.

778,64? ATTORNEY BY @Ww, K4 7 Patented Sept. 8, 1936 PATENT OFFICE COMBINED TAP AND SURFACING-Y IMPLEMENT Alfred'E. Dennis and Irvin L. Dennis, Oskaloosa, Kans.

Application September 30,1935, Serial No. 42,782:

1 Claim.

Our invention relates to improvements, in combined; taps and surfacing implements.

It relates particularly to an implement includh ing. a-tap and a cutting-tool arranged to have 5 the tool cut the surfaceof a body around'a threaded hole in which at the time the tap is fitted.

It is adaptable for reaming out the-threaded hole in which a spark plug has been fitted, and

' for cutting and cleaning the surface around the hole to enable the spark plug, which is to be inserted intov the hole, to, have good electrical connection with the engine body.

One of the objects of our invention is to provide a; novel implement of the kind described in which the cutting tool is adapted for free revolution on the tap and for movement into and out of its cutting position longitudinally on the tap, whereby'the cutting" tool may be withheld from its cutting'position' until the tap has been revolved to a position in which it will have cleared the threaded hole, following which the cutting tool may be independently revolved on the tap an amount sufficient for clearing the surface around the hole to the extent desired.

A further object of our invention is the provision of novel means by which the cutting tool may be revolved independently of the tap or simultaneously with it.

Still another object of our invention is the provision of a novel implement of the kind described, which is simple, cheap, durable, not likely to get out of order, which is easy to operate and which is efficient in its operation.

The novel features of our invention are hereinafter fully described and claimed.

In the accompanying drawing which illustrates the preferred embodiment of our invention,

Fig. 1 is a central longitudinal sectional view of our improved implement, showing the tap operatively mounted in the threaded hole in the engine body and locked to the cutting tool, the latter being shown out of its operative position.

Fig. 2 is a vertical View partly in side elevation and partly in vertical section, showing the tap mounted in the threaded hole in the engine body and the cutting tool revoluble on the tap and in the cutting position, with the handle disposed in the upper hole in the cutting tool and disengaged from the tap.

Fig. 3 is an end view of the implement.

Fig. 4 is a side View of the cutting tool, with the handle in the tool and broken away.

Fig. 5 is an end View of what is shown in Fig. 4.

Similar characters of 1* reference: designate.;sim-.- ilar. parts in the difierentviews.

[designates the shank of the tapWhiChZiSj'pFOe vided adjacentto oneendwitha threaded; 116-.- u ripheral, cutting portion 2, which is-.intersecte.d '5 by spaced apart longitudinal slots; which at their innerends, communicate. with a,.1ongitudi. nal central hole 4 extending from; the. adjacent end, and whichsis, adapted totreceive. cuttings I made by the cutting edges .3. of; thexthreads'th-at are-intersected by the slots3.

A, plugv 51 is. removably fitted in thecuter. end of the hole 4 to, prevent thecuttings fallingfrom the hole 4 into the engine body duringthecute I ting operation of, the tap.

Mounted; and adapted, for; free revolutionon the tap shank I is a tubular cutting: tool .6; which is also adapted for; longitudinal: sliding movement on the shank I;

, The end of the cutting tool 6-, which-is. adjacent 2-0 to the threaded portion 2 of the tap is provided with cutting edges 1.

To limit the longitudinal movement of the cutting tool 6 on the shank, a transverse stop screw 8 is fitted in a threaded hole in the cut- 25 ting tool 6 adjacent to the cutting edges 1, the screw extending into an annular peripheral groove 9 in the shank I.

For rotating the tap in its cutting operation, and at the same time holding the cutting tool 6 30 out of its cutting position, the tap shank l is provided with a transverse hole It! therethrough which is adapted to aline with a transverse hole ll extending through opposite walls of the cutting tool 6. A handle comprising a rod I2 is 35 adapted for insertion through the alined holes 10 and II and to project from opposite sides of the cutting tool 6, as shown in Fig. 1.

With the parts so assembled, the threaded portion 2 of the tap is screwed into a spark plug 40 threaded hole l3 in an engine body [4, as shown in Fig. 1, during which operation the cutting edges 3 of the threads of the tap cut away rust and scale which may have formed in the plug hole l3, thus providing a clean conductive metal contacting surface for grounding the spark plug when it is screwed into the engine body.

After the spark plug hole l3 has thus been cleaned, the handle I2 is removed from the alined 50 holes l0 and H and is inserted through a hole l5 which extends clear through the cutting tool 6 in a transverse plane which is above the plane of the hole H, and which is above and spaced from the upper end of the tap shank I when the cutting 55 tool 6 is lowered to its lowest position on the shank I.

The cutting tool 6 is then slid downwardly on the shank l until the cutting edges 1 of the cutting tool rest on the surface of the engine body encircling the hole l3 in the engine body l4, as shown in Fig. 2. The cutting tool 6 is then revolved in the proper direction for cutting on the shank Lby the handle l2, downward pressure being applied to the cutting tool, the cutting edges 1 of which will remove rust and scale from the surface of the engine body adjacent to and encircling the hole l3, so that a clean conductive contact surface is provided against which the spark plug, when inserted in the hole I3, may

bear.

Upon removing the handle I2 and screwing the screw 8 out of the annular groove 9, the cutting tool 6 may be removed from the shank I, and with the use of the handle l2 either the tap or cutting tool may be separately used.

After the tapping and surfacing operations, the cutting tool is slid upwardly, the handle [2 having been removed, until the hole H alines with the hole I 0. The handle I2 is then reinserted in the alined holes l and l I and the tap unscrewed out of the hole I3. The plug is then removed from the hole 4 and'the cuttings therein are removed, following which the plug is again inserted in the hole 4.

By having the slots 3, which communicate with the end hole 4 in the tap, intersecting, as shown, a number of the threads of the cutting portion'Z, a number of cutting edges 3 are provided and ample spaces are provided for receiving cuttings as well as reducing the frictional resistance to the inward screwing of the tap.

By having the interior diameter of the cutting end portion of the surfacing tool 6 greater than the diameter of the threaded portion 2 of the tap,

as shown, the threaded portion 2 of the tap may have the upper part thereof enter the tool 6, so that the cutting edge I may cut a surface above which the threaded portion at the time is projecting, as in Fig. 2. This is of importance when the hole that is being tapped is too shallow to receive the entire threaded portion 2 of the tap.

The implement comprising the tap l'and surfacing tool 6 may be employed for removing deposits in and around a threaded hole, as one which has contained a spark plug, or the tool may be employed to have the cutting portions 3' and 1 respectively cut the metal to thread the hole I3 and to cut the metal around the hole.

Many modifications of our invention, within the scope of the appended claim, may be made without departing from the spirit of our invention.

What we claim is:

A combined tap and surfacing implement in cluding a tap having a peripheral cutting portion, a tubular surfacing tool having at one end a cutting edge and revoluble on said tap and movable thereon to and from a position in which it is adapted to surface a portion of a body encircling a hole in said body in which said tap at the time is operatively engaged, said tap having therethrough a transverse hole, said tool having two transverse holes therethrough, the one nearer said cutting edge being adapted to aline with said hole in said tap when said cutting edge is out of its cutting position, the other hole in said tool being disposed out of transverse alinement with the tap when said tool has its cutting edge in the cutting position, and a handle member removably insertable through said hole in the tap and through the two holes in said tool.

ALFRED E. DENNIS. IRVIN L. DENNIS. 

